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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <form id="form1">
      <!-- autocomplete="off" 阻止自动填充的行为 -->
      <input type="text" name="uname" autocomplete="off" />
      <input type="password" name="upwd" id="" />
      <button type="submit">提交</button>
    </form>

    <script>
      // 通过dom操作 获取 form 表单元素
      let form = document.querySelector("#form1");
      form.addEventListener("submit", function (e) {
        // 阻止表单默认提交行为
        e.preventDefault();
        // 创建formdata 获取表单中数据
        let fd = new FormData(form);
        let xhr = new XMLHttpRequest();
        xhr.open("POST", "http://www.liulongbin.top:3006/api/formdata");
        xhr.send(fd);
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4 && xhr.status === 200) {
            console.log(JSON.parse(xhr.responseText));
          }
        };
      });
    </script>
  </body>
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